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Physics Past Questions and Answers

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Physics Questions

Question 2321:

Two solids P and Q of equal mass are heated to the same temperature and dropped simultaneously into two identical containers X and Y containing equal volumes of water at room temperature. The temperature of X will rise higher than that of Y only if the

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A Volume of P is greater than that of Q
B Specific heat capacity of P is higher than that of Q
C Density of P is greater than that of Q
D Density of P is lower than that of Q
E Specitic heat capacity of P is lower than that of Q.

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Question 2322:

lf the temperature of a small quantity of water in a closed container is gradually increased from 0^o to 40^oC then the density of the water within this range

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A Increases for a while and then decreases
B Decreases for a while and then increases
C Increases gradually
D Decreases gradually
E Remains the same

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Question 2323:

How much heat is given out when a piece of iron of mass 50g and specific heat capacity 460 Jkg^-1k^-1 cools from 85^oC to 25^oC?

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A 1.38 x 10⁶ J
B 2.53x10⁴J
C 7.66x10³J
D 1.38x10³J
E 1.27 X10³J

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Question 2324:

Heat transfer by convection in a liquid is due to the

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A Translatory motion of the molecules of the liquid
B Increased vibration of the molecules of the liquid about their mean positions
C Expansion of the liquid as it is heated
D Latent heat of vaporization of the liquid
E Ability of the liquid to evaporate at all temperatures

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Question 2325:

Which of the following is not a suitable method for reducing loss of heat from a piece of hot iron?

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A Wrapping it in cotton wool
B Painting it black
C Placing it in a vacuum
D Placing it on rubber supports
E Keeping it in a closed wooden box

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